{
  "title": "Five-frame real nightscape teaching case",
  "photographer": "Filippo Dall’Aglio (@flick87)",
  "sourcePage": "https://discuss.pixls.us/t/open-source-tool-for-sky-stacking-and-foreground-extraction/17204",
  "license": "CC BY-SA 4.0",
  "licenseUrl": "https://creativecommons.org/licenses/by-sa/4.0/",
  "derivativesLicense": "CC BY-SA 4.0",
  "rawpyVersion": "0.27.1",
  "librawVersion": [
    0,
    22,
    1
  ],
  "whiteBalance": [
    1675.0,
    1024.0,
    2149.0,
    1024.0
  ],
  "linearExposureMultiplier": 4.0,
  "conversion": "LibRaw linear16 sRGB primaries; auto brightness disabled; first-frame camera WB locked across all five; EXIF rotation applied; area resize in linear light to 1600px long side; common +2EV multiplier; sRGB transfer encoded into 16bit RGB TIFF with embedded standard sRGB ICC; Deflate strips and horizontal predictor. Public teaching files additionally inverse-sRGB linearized, area-resized to 641×960, sRGB re-encoded and quantized to 8bit; JPEG quality85/subsampling0 with embedded sRGB ICC. This second resize follows the retained 1068×1600 intermediate.",
  "dimensions": [
    641,
    960
  ],
  "excluded": [
    "IMG_0431.CR2 separate foreground",
    "Previously processed author JPEGs"
  ],
  "files": [
    {
      "name": "IMG_0433-srgb8-960.jpg",
      "size": 160265,
      "lastModified": 1700000000000,
      "sha256": "c2c13c1ea8fcee8a5b384c1e47806e1b8a48e75e64ae2222cfb54072654bd7ab",
      "source": "IMG_0433.CR2",
      "sourceSha256": "012429e9ab983237ecb8fde2f9a4a888878e70d0e235bbeb5f1f94e21d6d270b"
    },
    {
      "name": "IMG_0434-srgb8-960.jpg",
      "size": 159864,
      "lastModified": 1700000000000,
      "sha256": "7445897b62ec13f8005f13b1f9ac2f2ec3ae6c45c5174393b6b2d0ebef87e936",
      "source": "IMG_0434.CR2",
      "sourceSha256": "91bcc404d2955d2c93c29238d0af613656cf7f22052f2392f7ce726280a6c9b0"
    },
    {
      "name": "IMG_0435-srgb8-960.jpg",
      "size": 159456,
      "lastModified": 1700000000000,
      "sha256": "5f3721c1b3ce6e7c68c0972cfd6bab5148b9a877ff985357d94186129d46488e",
      "source": "IMG_0435.CR2",
      "sourceSha256": "01f908c8f284b802149c17ec0df58b971b6832baa6dc7da0a8867fd8ab602ddb"
    },
    {
      "name": "IMG_0436-srgb8-960.jpg",
      "size": 158956,
      "lastModified": 1700000000000,
      "sha256": "5c8d0ec98fc56e69a7af2d39a66e36f57bb55110943069c869ed2e11acc4ebe7",
      "source": "IMG_0436.CR2",
      "sourceSha256": "a0e40a2a2162f2e1da0f86e8550ddac7040c869697e821e5c6f0e3a21c34ebf5"
    },
    {
      "name": "IMG_0437-srgb8-960.jpg",
      "size": 158782,
      "lastModified": 1700000000000,
      "sha256": "5c501499ac154f929b66b8cc3305535a0955386404550136d2455766b93da50e",
      "source": "IMG_0437.CR2",
      "sourceSha256": "344e12e8cd14c0fff93f1b557ebcf493a295771275971ed4aa7fc520f2b89c5b"
    }
  ],
  "limitations": [
    "Real nightscape/starfield sequence; there is no obvious Milky Way core in these photos.",
    "Teaching inputs are 641×960 8-bit lossy JPEGs derived from RAWs, not original resolution.",
    "Downsampling and JPEG compression change noise and stars; this is not a quantitative noise or full-resolution lens benchmark.",
    "A 16-bit TIFF output does not restore precision or detail missing from 8-bit JPEG sources.",
    "No lens correction, denoising, sharpening, local contrast or per-frame automatic exposure was applied during preparation.",
    "All photo derivatives, inputs and outputs remain CC BY-SA 4.0 with attribution."
  ],
  "sourcePrecision": "8-bit lossy JPEG teaching inputs"
}